生物
白色念珠菌
突变体
细胞生物学
真菌蛋白
蛋白激酶A
白色体
信号转导
菌丝
激酶
生物化学
微生物学
基因
作者
Guisheng Zeng,Xiaoli Xu,Yee Jiun Kok,Fu-Sheng Deng,Eve W. L. Chow,Jiaxin Gao,Xiaoning Bi,Yan Ming Wang
出处
期刊:Cell Reports
[Elsevier]
日期:2023-12-01
卷期号:42 (12): 113473-113473
标识
DOI:10.1016/j.celrep.2023.113473
摘要
In the human fungal pathogen Candida albicans, invasive hyphal growth is a well-recognized virulence trait. We employed transposon-mediated genome-wide mutagenesis, revealing that inactivating CTM1 blocks hyphal growth. CTM1 encodes a lysine (K) methyltransferase, which trimethylates cytochrome c (Cyc1) at K79. Mutants lacking CTM1 or expressing cyc1K79A grow as yeast under hyphae-inducing conditions, indicating that unmethylated Cyc1 suppresses hyphal growth. Transcriptomic analyses detected increased levels of the hyphal repressor NRG1 and decreased levels of hyphae-specific genes in ctm1Δ/Δ and cyc1K79A mutants, suggesting cyclic AMP (cAMP)-protein kinase A (PKA) signaling suppression. Co-immunoprecipitation and in vitro kinase assays demonstrated that unmethylated Cyc1 inhibits PKA kinase activity. Surprisingly, hyphae-defective ctm1Δ/Δ and cyc1K79A mutants remain virulent in mice due to accelerated proliferation. Our results unveil a critical role for cytochrome c in maintaining the virulence of C. albicans by orchestrating proliferation, growth mode, and metabolism. Importantly, this study identifies a biological function for lysine methylation on cytochrome c.
科研通智能强力驱动
Strongly Powered by AbleSci AI